John Chrysostom
As there the Apostle said, "Whom I serve in the gospel of His Son" (Rom 1:9), so here, after saying, "because of the grace given to me by God," he adds, "that I might be a minister of Jesus Christ among the Gentiles, ministering the gospel of God."
After sufficiently proving what he has said, the Apostle turns his speech to the highest dignity of his apostleship. He calls it not simply service, as at the beginning, but sacred service and sacred ministry.
To preach and proclaim the gospel is my priesthood. This is the sacrifice offered by me. No one can reproach a priest for caring about the purity of the sacrificial offerings.
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By these words the Apostle both gives wings to the thoughts of the faithful, showing them that they are a sacrifice, and justifies himself by saying that he has been so commanded.
My sacrificial knife, he says, is the Gospel and the word of preaching. My aim is not to glorify myself or become renowned, but "that the offering from the Gentiles may be acceptable and sanctified by the Holy Spirit."
That is, may the souls of those taught by me be pleasing to God. God, who brought me forth for this work, did not so much wish to glorify me as He cared for you.
How, then, can the offering become acceptable? In the Holy Spirit. Faith alone is not needed, but also spiritual life, so that we may keep within ourselves the Spirit once given.
For us, not wood and fire, not altar and knife, but the Spirit is everything. Therefore I strive by every means so that this fire may not be extinguished, since this has been entrusted to me.
Why, then, do you say this to those who have no need? For this reason, the Apostle answers, I do not teach, but remind. As the priest in the Old Testament stood before God, kindling the fire, so I stand, stirring up your zeal.
And notice, he did not say, "that the offering from you may be acceptable," but, "the offering from the Gentiles." By the word "Gentiles" he means the inhabited world, that is, all land and sea.
Thus he humbles the pride of the Romans, so that they may not consider it unworthy to have as their teacher one whose influence extends to the ends of the world.
He said the same at the beginning of the epistle: "as among the other Gentiles. I am a debtor both to Greeks and to barbarians, both to the wise and to the foolish" (Rom 1:13-14).